Regenerate analyticsreporting client (googleapis#5837)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2020-09-03 03:39:06,587 synthtool [DEBUG] > Executing /home/kbuilder/.cache/synthtool/google-api-java-client-services/synth.py.
On branch autosynth-analyticsreporting
nothing to commit, working tree clean
2020-09-03 03:39:06,947 synthtool [DEBUG] > Cloning https://github.com/googleapis/discovery-artifact-manager.git.
DEBUG:synthtool:Cloning https://github.com/googleapis/discovery-artifact-manager.git.
2020-09-03 03:39:07,333 synthtool [DEBUG] > Cleaning output directory.
DEBUG:synthtool:Cleaning output directory.
2020-09-03 03:39:07,335 synthtool [DEBUG] > Installing dependencies.
DEBUG:synthtool:Installing dependencies.
2020-09-03 03:39:08,957 synthtool [INFO] > Generating analyticsreporting v4.
INFO:synthtool:Generating analyticsreporting v4.
2020-09-03 03:39:08,957 synthtool [INFO] > 	1.30.1
INFO:synthtool:	1.30.1
Writing json metadata to clients/google-api-services-analyticsreporting/v4.metadata.json
2020-09-03 03:39:09,869 synthtool [DEBUG] > Wrote metadata to clients/google-api-services-analyticsreporting/synth.metadata.
DEBUG:synthtool:Wrote metadata to clients/google-api-services-analyticsreporting/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/6adb2d69-07c3-4dbb-bd5a-e4fae2984f79/targets

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Author: yoshi-automation